Class IX

Brass is a
  1. Compound
  2. Element
  3. Homogeneous mixture
  4. Heterogeneous mixture
Diamond is lustrous because
  1. it is colourless
  2. it is hard
  3. it is pure
  4. its refractive index is high
Mixture can be
  1. homogeneous
  2. heterogeneous
  3. Both of these
  4. pure substance
Which of the following is NOT true about colloids ?
  1. Particles in a colloid can pass through filter paper
  2. A colloid is a homogeneous solution
  3. Colloidal particles exhibit Brownian motion
  4. Colloidal particles exhibit electrophoresis.
Air shows the property of
  1. N2
  2. O2
  3. Both (a) and (b)
  4. None of these.
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